Vulnerability-Lookup

GHSA-4RJ2-PR7F-CMPG

Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-28 09:31

Details

In the Linux kernel, the following vulnerability has been resolved:

RDMA/core: Validate the passed in fops for ib_get_ucaps()

Sashiko pointed out it is not safe to rely only on the devt because char/block alias so if the user finds a block device with the same dev_t it can masquerade as a ucap cdev fd.

Test the f_ops to only accept authentic cdevs.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53188"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T09:16:36Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Validate the passed in fops for ib_get_ucaps()\n\nSashiko pointed out it is not safe to rely only on the devt because\nchar/block alias so if the user finds a block device with the same dev_t\nit can masquerade as a ucap cdev fd.\n\nTest the f_ops to only accept authentic cdevs.",
  "id": "GHSA-4rj2-pr7f-cmpg",
  "modified": "2026-06-28T09:31:43Z",
  "published": "2026-06-25T09:31:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53188"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a1b1ac2744694a2ecd66a84bdb1445f4ef24bee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96b6e98ff12d50ed5817230c6f1188e1150d225d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa181287ebdcc53ee0ba5c2f8243e2d541ebc19b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-53188 (GCVE-0-2026-53188)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-08-05 12:33

Title

RDMA/core: Validate the passed in fops for ib_get_ucaps()

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Validate the passed in fops for ib_get_ucaps() Sashiko pointed out it is not safe to rely only on the devt because char/block alias so if the user finds a block device with the same dev_t it can masquerade as a ucap cdev fd. Test the f_ops to only accept authentic cdevs.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/96b6e98ff12d50ed5…
https://git.kernel.org/stable/c/aa181287ebdcc53ee…
https://git.kernel.org/stable/c/4a1b1ac2744694a2e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 61e51682816d395307f78ae06d640089054c28ab , < 96b6e98ff12d50ed5817230c6f1188e1150d225d (git) Affected: 61e51682816d395307f78ae06d640089054c28ab , < aa181287ebdcc53ee0ba5c2f8243e2d541ebc19b (git) Affected: 61e51682816d395307f78ae06d640089054c28ab , < 4a1b1ac2744694a2ecd66a84bdb1445f4ef24bee (git)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/core/ucaps.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "96b6e98ff12d50ed5817230c6f1188e1150d225d",
              "status": "affected",
              "version": "61e51682816d395307f78ae06d640089054c28ab",
              "versionType": "git"
            },
            {
              "lessThan": "aa181287ebdcc53ee0ba5c2f8243e2d541ebc19b",
              "status": "affected",
              "version": "61e51682816d395307f78ae06d640089054c28ab",
              "versionType": "git"
            },
            {
              "lessThan": "4a1b1ac2744694a2ecd66a84bdb1445f4ef24bee",
              "status": "affected",
              "version": "61e51682816d395307f78ae06d640089054c28ab",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/core/ucaps.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.36",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.13",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Validate the passed in fops for ib_get_ucaps()\n\nSashiko pointed out it is not safe to rely only on the devt because\nchar/block alias so if the user finds a block device with the same dev_t\nit can masquerade as a ucap cdev fd.\n\nTest the f_ops to only accept authentic cdevs."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached locally through the RDMA uverbs character device by submitting GET_CONTEXT with a user-controlled fd array.\nAC:L - There is no race or fragile memory condition; on a system with a matching accessible block-device dev_t, exploitation is a straightforward fd substitution.\nPR:L - An unprivileged local user can open the world-accessible uverbs device, and the bypass avoids the intended root-only UCAP character device permission check.\nUI:N - No victim action is required once the attacker can run local code and open the relevant device files.\nS:C - The bypass can grant mlx5 RDMA control capabilities including other-VHCA control, plausibly affecting HCA/vport resources outside the attacker\u0027s normal RDMA security context.\nC:H - Unauthorized RDMA control and flow steering can expose or redirect RDMA traffic and resources that should require an explicitly granted UCAP.\nI:H - The attacker can obtain privileged RDMA/HCA control capabilities that may allow modification or redirection of RDMA flow state and other protected device behavior.\nA:H - The same unauthorized control can be used to drop, disrupt, or exhaust RDMA/HCA resources, causing loss of availability for affected RDMA workloads."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:33:55.380Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/96b6e98ff12d50ed5817230c6f1188e1150d225d"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa181287ebdcc53ee0ba5c2f8243e2d541ebc19b"
        },
        {
          "url": "https://git.kernel.org/stable/c/4a1b1ac2744694a2ecd66a84bdb1445f4ef24bee"
        }
      ],
      "title": "RDMA/core: Validate the passed in fops for ib_get_ucaps()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53188",
    "datePublished": "2026-06-25T08:39:00.960Z",
    "dateReserved": "2026-06-09T07:44:35.390Z",
    "dateUpdated": "2026-08-05T12:33:55.380Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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